You lot revel in saying "fuck" and cunt" on here to intimidate posters who aren't comfortable with that language
They're doing it in reaction to people trying to dictate to them how they can and can't express themselves, and in my opinion that's a reasonable response. If a random stranger told any of us that we should change, eg, our clothes or our appearance in general because they found our appearance unpleasant and off-putting, we would be highly unlikely to say 'Oh, of course, I'm so sorry' and start dressing differently. We would continue to dress exactly as we wanted in their presence, and most people would think we were totally reasonable to do so, rather than thinking we were trying to bully or intimidate someone. Language is no different to that. It's a personal preference and nobody has the right to go about their day unoffended.
Adults telling other adults not to swear are essentially suggesting that their arbitrary preferences are more important than anyone else's, and to 'expect' (as the OP said she does) other people to conform to that is overbearing and entitled and every bit as rude as swearing, and deserves every bit of push-back.
If I know someone personally who is upset by swearing, and who manages to express that without telling me off like a teacher reprimanding a child, I don't swear in front of them. I never swear in front of my mum, or my MIL, or in the company of my friends' children, for instance. But none of those people ever start blustering about what they 'expect', implying that swearing is a sign of ignorance or poor vocabulary (it doesn't, and studies have repeatedly proved that) or implying that the world should be adjusted around them. They're people I care about and who treat me with respect, so I treat them with respect in return and I don't swear.
Someone I don't know from Adam, who informs me that they 'expect' me to express myself in their preferred manner in an online space for adults, isn't treating me with respect and therefore I don't modify my behaviour to pander to them.
Also, I do just really like the word 'cunt'.